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More discoveries soon followed: magenta, Hofmann’s violet, Lyons blue, malachite green, Bismarck brown and aniline black.

Shaw's—Borax, 3 ozs.; orange shellac, 5 ozs.; water, q. s.; boil and add soluble aniline black or nigrosine, q. s.

They include aniline black, a permanent black produced by the oxidation of aniline, and the ice colours, which are azo dyes derived from certain coal-tar products containing nitrogen.

Aniline Black differs from other dyes in that it is not sold as a ready-made dyestuff, but is produced in situ upon the fibre by the oxidation of aniline.

The discovery of other brilliant aniline dyestuffs followed in rapid succession, and the dyer was in the course of a few years furnished with Magenta, Aniline Blue, Hofmann’s Violet, Iodine Green, Bismarck Brown, Aniline Black, &c.